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Sat, 27 Jan 2024 12:30:14 +0000 Date: Sat, 27 Jan 2024 12:30:10 +0000 (UTC) From: RJ Marquette To: "linux-raid@vger.kernel.org" Message-ID: <410329971.892462.1706358610883@mail.yahoo.com> In-Reply-To: <6b65096d-3833-4aeb-ac88-7cabcab3d877@plouf.fr.eu.org> References: <432300551.863689.1705953121879.ref@mail.yahoo.com> <544664840.269616.1706131905741@mail.yahoo.com> <5112393.323817.1706145196938@mail.yahoo.com> <1822211334.391999.1706183367969@mail.yahoo.com> <17 00056512 .428301.1706195329259@mail.yahoo.com> <1421467972.497057.1706207603224@mail.yahoo.com> <394943768.706124.1706282116746@mail.yahoo.com> <277668438.720791.1706285018378@mail.yahoo.com> <1795235772.837302.1706312745369@mail.yahoo.com> <6b65096d-3833-4aeb-ac88-7cabcab3d877@plouf.fr.eu.org> Subject: Re: Requesting help recovering my array Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Mailer: WebService/1.1.22046 YMailNorrin On Saturday, January 27, 2024 at 04:08:21 AM EST, Pascal Hambourg wrote: > You should be able to rebuild the array on top of the partitions by > subtracting the partition offset from the data offset. If the partitions > all begin at sector 2048: > --data-offset=3D$((262144-2048))s Thanks.=C2=A0 I might try that after I get the new drive... and back everyt= hing up. > Beware that /dev/sd* names are not always persistent across reboots, so > check that the disks are in the same order as during the previous boot. Yeah, so far I haven't had that problem, but I do know it's possible.=20 > RAID5 provides disk fault tolerance. If you only need disk aggregation, > you could use RAID0 or LVM instead. Well the original reason for this array when I built it was that huge drive= s, like 12 TB (the effective capacity of the array), weren't affordable, if= they were available at all.=C2=A0 That's the point I was trying to make - = the need for an array to get 12 TB of storage has gone by the wayside; I ca= n just buy 12 TB drives.=C2=A0 I have no plan to move away from the array f= or now, though, I figure I'll keep using it until drives start dying or I t= ruly fill it up, then decide. Thanks. --RJ On 27/01/2024 at 00:45, RJ Marquette wrote: > Quick follow up:=C3=82=C2=A0 When I rebooted, the partition tables got mu= nged > again.=C3=82=C2=A0 Definitely a BIOS issue.=C3=82=C2=A0 I have a 10TB dri= ve on order, so I'll > copy everything off, then rebuild the array in the recommended format > with partitions, and see what happens then You should be able to rebuild the array on top of the partitions by=20 subtracting the partition offset from the data offset. If the partitions=20 all begin at sector 2048: --data-offset=3D$((262144-2048))s Beware that /dev/sd* names are not always persistent across reboots, so=20 check that the disks are in the same order as during the previous boot. > (though one wonders if I even need an array when a single drive can > hold everything...). RAID5 provides disk fault tolerance. If you only need disk aggregation,=20 you could use RAID0 or LVM instead.